<template>
  <div>
    <table border="1" width="700" style="border-collapse: collapse">
      <caption>
        购物车
      </caption>
      <thead>
        <tr>
          <th><input type="checkbox" v-model="isAllFn" /> <span>全选</span></th>
          <th>名称</th>
          <th>价格</th>
          <th>数量</th>
          <th>总价</th>
          <th>操作</th>
        </tr>
      </thead>
      <Tr :goodList="goodList" @del="delFn" @minus="minusFn" @plus="plusFn" @change="changeFn" />
      <tfoot>
        <Total :totalPrice="goodList.filter(item=>item.checked)" />
      </tfoot>
    </table>
  </div>
</template>

<script>
import Tr from './components/tr.vue'
import Total from './components/total.vue'
export default {
  components: {
    Tr,
    Total
  },
  methods: {
    delFn(name) {
      this.goodList = this.goodList.filter((item) => item.name !== name)
    },
    minusFn(name) {
      let obj = this.goodList.find((item) => item.name === name)
      obj.num >= 1 ? obj.num-- : obj.num
    },
    plusFn(name) {
      let obj = this.goodList.find((item) => item.name === name)
      obj.num++
    },
    changeFn(name){
      let obj = this.goodList.find((item) => item.name === name)
      obj.checked = !obj.checked
    }
  },
  computed:{
    isAllFn:{
     get(){
      return this.goodList.every(item=>item.checked)
     },
     set(val){
      this.goodList.forEach(item=>item.checked = val) 
     }
    }
  },
  data() {
    return {
      isAll: false,
      goodList: [
        {
          name: '诸葛亮',
          price: 1000,
          num: 1,
          checked: false,
        },
        {
          name: '蔡文姬',
          price: 1500,
          num: 1,
          checked: false,
        },
        {
          name: '妲己',
          price: 2000,
          num: 1,
          checked: false,
        },
        {
          name: '鲁班',
          price: 2200,
          num: 1,
          checked: false,
        },
      ],
    }
  },
}
</script>

<style></style>
